Comments on: AAS Reports: The Allen Telescope Array http://noisyastronomer.com/2010/01/20/aas-reports-the-allen-telescope-array/ Wed, 25 Jan 2012 18:33:10 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Open Laboratory 2010 – submissions now closed – see all the entries | A Blog Around The Clock http://noisyastronomer.com/2010/01/20/aas-reports-the-allen-telescope-array/#comment-528 Open Laboratory 2010 – submissions now closed – see all the entries | A Blog Around The Clock Wed, 01 Dec 2010 08:16:48 +0000 http://noisyastronomer.com/?p=855#comment-528 [...] Astronomer’s Noise: SDO: Learning to Live with our Sun One Astronomer’s Noise: AAS Reports: The Allen Telescope Array One Astronomer’s Noise: AstroJargon of the Week: [...] [...] Astronomer’s Noise: SDO: Learning to Live with our Sun One Astronomer’s Noise: AAS Reports: The Allen Telescope Array One Astronomer’s Noise: AstroJargon of the Week: [...]

]]> By: Nicole http://noisyastronomer.com/2010/01/20/aas-reports-the-allen-telescope-array/#comment-527 Nicole Sun, 28 Feb 2010 17:39:44 +0000 http://noisyastronomer.com/?p=855#comment-527 Good question. On Earth, the EM waves have to travel through a medium and around obstacles, and these are not a factor in interstellar space. We can, after all, see microwave radiation from billions of light years away! I've heard the argument for searching at L-band since hydrogen, the most common element in the universe, emits a spectral line at 1.4 GHz. So a radio-savvy civilization that wanted to be heard would transmit at that frequency, knowing that others are already using that band for studying astrophysics. (On Earth, there's actually a small, protected band for radio astronomy around that line.) Good question. On Earth, the EM waves have to travel through a medium and around obstacles, and these are not a factor in interstellar space. We can, after all, see microwave radiation from billions of light years away!

I’ve heard the argument for searching at L-band since hydrogen, the most common element in the universe, emits a spectral line at 1.4 GHz. So a radio-savvy civilization that wanted to be heard would transmit at that frequency, knowing that others are already using that band for studying astrophysics. (On Earth, there’s actually a small, protected band for radio astronomy around that line.)

]]> By: Phil http://noisyastronomer.com/2010/01/20/aas-reports-the-allen-telescope-array/#comment-526 Phil Sun, 28 Feb 2010 17:13:51 +0000 http://noisyastronomer.com/?p=855#comment-526 "Microwave window" that comes through Earth's atmosphere clearly, from about 0.5 to 11 gigahertz? Shouldn't they be looking at lower freqs? Even here on Earth we know Microwaves don't travel as far as compared to lower band freqs. “Microwave window” that comes through Earth’s atmosphere clearly, from about 0.5 to 11 gigahertz?

Shouldn’t they be looking at lower freqs?
Even here on Earth we know Microwaves don’t travel as far as compared to lower band freqs.

]]>